Radar の放射状目盛の位置とラベルはユーザーが定義できます

ScottPlot.Plot myPlot = new();

double[,] values = {
    { 78,  83, 84, 76, 43 },
    { 100, 50, 70, 60, 90 }
};

var radar = myPlot.Add.Radar(values);

double[] tickPositions = { 25, 50, 75, 100 };
string[] tickLabels = tickPositions.Select(x => x.ToString()).ToArray();
radar.PolarAxis.SetCircles(tickPositions, tickLabels);

myPlot.SavePng("demo.png", 400, 300);